[Lapack] Problem with DGELSD

From: James, Rodney
Date: Mon, 19 Mar 2012 12:54:58 -0600

Bill,
I tried your original matrices (without the perturbation) in DGELSD in v3.4.0
as well as v3.2.1 (this is the version supplied with MacOS 10.7 if you use
-llapack) and they both work.
Is the problem you are seeing only present in v3.1.1?
Rodney
On Mar 15, 2012, at 5:21 AM, Bill Birkett wrote:

Hello, LAPACK team,
I ran into a problem with DGELSD, which is described in the attached text
file.
I've compared the source code of v3.1.1 to v3.4.0, and I don't see
any differences that would change these results.
This may be a bug, or perhaps a lack of understanding on my part.
I'm trying to 'train' a neural network, which is the origin of these
strange looking matrices.
DGELSS works correctly with the same inputs.
-Bill
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